code: def forward_expected(self, inputs):
      (x,) = inputs
      expected = x.copy()
      expected[expected < 0] = 0
      return (expected,)
  
file_path: chainer/tests/chainer_tests/functions_tests/activation_tests/test_relu.py
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 3 for calling the TestReLU obj's underlying member method code with example usage: obj.forward_expected(inputs) and returns: expected